/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Returns a control's preferred rotator (local transform rotation)
Returns the current preferred rotator
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=URigHierarchy) FRotator GetControlPreferredRotatorByIndex ( int32 InElementIndex, bool bInitial ) const